Of clearance from class b flues 2 in.
Air sealing around chimney in attic.
Air sealing the attic perimeter.
Because the pipe gets hot building codes usually require 1 inch of clearance from metal flues 2 inches from masonry chimneys to any combustible material including insulation.
Either work from the interior as walter suggests or temporarily remove the vinyl siding and j channel and work from the exterior.
Because the pipe gets hot building codes require 1 in.
Measure and cut the flashing for each side of the chimney using sheet metal cutters.
The opening around a furnace or water heater flue is a major source of warm air into the attic photo 5.
For larger holes filler material may be needed.
Air sealing the wall plate around the perimeter of your attic blocks air from escaping around the outer edges of your home.
The opening around a furnace or water heater lue or chimney can be a major source of warm air moving in the attic.
If there s no wood staple it right to the drywall.
Put on work gloves.
Furnace flues require special sealing techniques.
As you note the chase on the attic floor is not as much of a problem because your basement and your attic are both inside of your thermal envelope.
Seal fireplace and furnace holes.
Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs.
Set up a cordless drill with a.
Sealing an air leak around a chimney in the attic 1.
Because the pipe gets hot building codes usually require 1 inch of clearance from metal lues 2 inches from masonry chimneys to any combustible.
It s easy to overlook electrical wires ducts pipes and vents in the attic but the openings around these are holes can compromise the air sealing of your attic.
It s usually the hardest place to air seal because the cramped space underneath the eaves where the roof rafters rest on the outer wall makes it hard to move your hands and head.
Caulk gun you need a caulk gun and know how to use it in order to fill air leaks with caulk.
Heat resistant caulk use this type of caulk when sealing air leaks around fireplaces chimney and flues.
Sealing attic air leaks.
From masonry chimneys to any combustible material including insulation.
So you should certainly seal the air leaks around the chimney at this location by installing metal flashing with sealed seams around the chimney on the underside of the rafters.
To seal these openings use caulk or spray foam.